TM 10-3930-671-24 Table 2-2.  Unit Troubleshooting Procedures - CONT: MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION HYDRAULIC SYSTEM (CONT.) 17. NOISY PUMP - CONT. Step 3. Remove and clean hydraulic tank strainer (Appendix F, Hydraulic Sump - Fluid and Filter Change, Section 10.1). If pump is still noisy, replace hydraulic pump.  Notify DS/GS maintenance. 18. OIL LEAKS AT EITHER END OF MAIN OR AUXILIARY VALVE SPOOL. Step 1. Main hydraulic control valve faulty. Replace main hydraulic control valve.  Notify DS/GS maintenance. 19. SPRING-CENTERED SPOOLS DO NOT RETURN TO NEUTRAL (MAIN OR AUXILIARY VALVE). Step 1. Check levers and linkage for binding. If levers or linkage are binding, adjust or replace levers (Appendix F, Main Hydraulic Control Valve, Section 10.5). If levers and linkage are OK, main valve faulty.  Notify DS/GS maintenance. Step 2. Main hydraulic control valve faulty. Repair hydraulic main control valve.  Notify DSIGS maintenance. 20. NO MOTION, SLOW OR JERKY ACTION OF HYDRAULIC SYSTEM. Check levers and linkage for binding. If levers or linkage are binding, adjust or replace levers (Appendix F, Main Hydraulic Control Valve, Section 10.5). If levers and linkage are OK, replace relief valve (located in main valve).  Notify DS/ GS maintenance. 2-13